Microchip RN4871 Handleiding


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© Microchip Technology, Inc. 20 RN4870 v1.42 Release Notes 21
RN4870/ Firmware 71 1.42 Release Note
9/ / 01 2021
1 Overview
This release note provides details on the firmware Rev 1.42 that is released for the
RN4870 and RN4871 modules.
2 New Features
Rev 1.42 incorporates a new command to change the UART immediately
without the need for a reboot (unlike the SB command).
- SBI, <8-bit hex value>
- The input parameter is an 8-bit hex value in the range of 00 to 0B,
representing baud rate from 2400 to 921K as shown in table below.
-
Hex value
Baud rate
00
921000
01
460800
02
230400
03
115200
04
57600
05
38400
06
28800
07
19200
08
14400
09
9600
0A
4800
0B
2400
- Default: 03
- Example: SBI,07 //Set the UART baud rate to 19200
immediately
- Response: AOK //Success
- ERR //Syntax error or invalid parameter
3 Resolved Issues
Fixed ANSSI vulnerabilities
Fixed Sweyntooth vulnerabilities
Modified the SM command to limit the range of timers 2 and 3. The value can
be set for these timers should be between 0 to 0x0FFE.
© Microchip Technology, Inc. 20 RN4870 v1.42 Release Notes 21
4 Known Issues
The feature that is supported in the RN487x firmware ‘Accepted List’
supports public address and fixed static random address but not resolvable
random address.
5 Recommendations
Hardware Flow Control
When using Transparent UART for streaming data application, it is important to
include the RTS/CTS hardware lines and enable the hardware control feature.
Without hardware flow control, it is possible for host to cause buffer overflow on
RN4870 UART, which can result in instability.
Await for ‘AOK’ before sending next command
When issuing frequent RN4870/71 GATT access commands (SHW, SHR, SUW, SUR,
CHW, CHR, CUW, CUR), higher command throughput is achieved by disabling flow
control. The host MCU issuing the GATT commands must wait for a response, such
as “AOK” before using the next command.
Connectable advertisements on Android devices
When using NA or IA commands to create custom connectable advertisements, the
connectable FLAGS field must be included for Android devices connection. This is
done by preceding flags advertisement payload with the “NA,01,06” command. See
the example below:
NA,Z
NA,01,06
NA,FF,CD00F014AD11CF40063F11E5BE3E0002A5D5C51B00BC00BD
Handle enumeration after clearing GATT services
If clearing or updating the GATT service and characteristic tables, please ensure that
they remain same and not changed when using static characteristic handle values in
a script or by a remote BLE client. If the characteristic handle values change, please
ensure to update the script or remote BLE client with the new handle values.
6 Firmware Update protocol
The firmware update protocol and process are documented in the firmware update User
guide that is available in the RN4870 webpage.
Refer to the following Github page for an example code that executes the firmware
update with a PIC32 MCU:
https://github.com/MchpBTApps/BM71_MemoryProgramming
Microchip also provides PC tools to update firmware via a host PC. The tools are
available to download from the BM70 webpage.


Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: RN4871

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